Original Cannondale stem with 1.5 stem clamp diameter.This stem will not work with Headshok forks and Lefty 1.0 steer tubes. Lefty 2.0 forks use a 1.5 inch clamp and will work with this stem.Manufacturer: CannondaleModel: C1 1.5 Stem Length: 80mmStem Angle: +/-5Stem Clamp Diameter: 1.5 Stem Length In Photos: 60mmHandlebar clamp diameter: 31.8mm